US20200091721A1 - Systems and methods to maximize power from multiple power line energy harvesting devices - Google Patents
Systems and methods to maximize power from multiple power line energy harvesting devices Download PDFInfo
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- US20200091721A1 US20200091721A1 US16/575,220 US201916575220A US2020091721A1 US 20200091721 A1 US20200091721 A1 US 20200091721A1 US 201916575220 A US201916575220 A US 201916575220A US 2020091721 A1 US2020091721 A1 US 2020091721A1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J11/00—Circuit arrangements for providing service supply to auxiliaries of stations in which electric power is generated, distributed or converted
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2513—Arrangements for monitoring electric power systems, e.g. power lines or loads; Logging
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/30—State monitoring, e.g. fault, temperature monitoring, insulator monitoring, corona discharge
Definitions
- the present application relates generally to distribution line monitoring, sensor monitoring, and power harvesting.
- Power harvesting using induction pick-up from the magnetic field surrounding a power distribution line can be used to provide power to distribution line monitoring sensors.
- the power line is routed through a current transformer whereby an AC signal is derived from the magnetic field induced by the AC current flow in the distribution line.
- the AC signal is converted to DC as part of the power harvesting process and used to power the monitoring sensors and associated electronics. This is typically referred to as “inductive harvesting using current transformers.”
- This disclosure generally provides distribution line monitoring sensors that include a number of features. Particularly, described herein are distribution line monitoring sensors with energy harvesting devices that are configured to maximize harvested power from power distribution lines. Additionally, described herein are distribution line monitoring sensors with energy harvesting devices that provide a constant current output characteristic to allow maximum utilization of power by connecting multiple devices in series or in parallel.
- this disclosure provides for the use of multiple magnetic cores to allow for installation on differing primary conductors in a polyphase power system. This provides advantages in overall redundancy, in cases where one or more of the polyphase conductors is disconnected or has insufficient harvesting capacity. Alternately, multiple magnetic cores can be placed on the same primary conductor in order to harvest more power than fewer cores could provide.
- a method of harvesting energy from one or more conductors of a power grid distribution network comprising the steps of harvesting energy from the one or more conductors with a first energy harvesting device installed on the one or more conductors, presenting an input current and an input voltage from the first energy harvesting device to a first energy harvesting circuit, drawing a first ratiometric current from the first energy harvesting device with the first energy harvesting circuit such that a ratio of the input voltage to the input current equals a desired loading resistance of the first energy harvesting circuit.
- the method can further comprise harvesting energy from the one or more conductors with a second energy harvesting device installed on the one or more conductors, presenting an input current and an input voltage from the second energy harvesting device to a second energy harvesting circuit, drawing a second ratiometric current from the second energy harvesting device with the second energy harvesting circuit such that a ratio of the input voltage to the input current equals a desired loading resistance of the second energy harvesting circuit, summing the first ratiometric current with the second ratiometric current to form a combined harvested current, and delivering the combined harvested current to a line monitoring device.
- drawing the first ratiometric current further comprises adjusting a resistance of the first energy harvesting circuit to the desired loading resistance.
- adjusting the resistance of the first energy harvesting circuit comprises implementing a plurality of cascading op-amps to be in balance when the input voltage divided by the input current equal the desired loading resistance.
- the desired loading resistance comprises 100 ohms.
- An energy harvesting circuit configured to receive an input current and an input voltage from an energy harvesting device is also provided, comprising a drive circuit configured to provide an output indicating if a load resistance of the energy harvesting circuit is above or below a desired load resistance, and a boost regulator configured to receive the output and to adjust the input voltage to match the load resistance of the energy harvesting circuit to the desired load resistance, wherein an output of the energy harvesting circuit is an output current set by the available power of the energy harvesting device when loaded with the load resistance of the energy harvesting circuit.
- the drive circuit comprises a plurality of cascading op-amps configured to be in balance when the input voltage divided by the input current equals the desired load resistance.
- the desired load resistance comprises 100 ohms.
- An energy harvesting system comprising a first energy harvesting circuit configured to receive a first input current and a first input voltage from a first energy harvesting device, the first energy harvesting circuit being configured to draw a first ratiometric current from the first energy harvesting device such that a first ratio of the first input voltage to the first input current equals a first desired loading resistance of the first energy harvesting circuit, a second energy harvesting circuit configured to receive a second input current and a second input voltage from a second energy harvesting device, the second energy harvesting circuit being configured to draw a second ratiometric current from the second energy harvesting device such that a second ratio of the second input voltage to the second input current equals a second desired loading resistance of the second energy harvesting circuit, a summation circuit configured to sum the first ratiometric current with the second ratiometric current into a combined current output, and a line monitoring device configured to receive the combined current output for operation.
- the first and second energy harvestings circuits each include a plurality of cascading op-amps configured to be in balance when the input voltage divided by the input current equals the desired load resistance.
- the first desired load resistance comprises 100 ohms.
- FIG. 1 illustrates an underground power distribution network with a plurality of harvesting devices located in close proximity to an underground enclosure.
- FIG. 2 shows the upper half of the power harvesting current transformer positioned above the lower half in what would be the closed position for normal operation.
- the upper and lower core halves separate with the mechanics of the housing to facilitate mounting the core on a power line.
- FIG. 3 shows an energy harvesting circuit configured to control the electrical output of an energy harvesting device and to allow for multiple instances to be paralleled.
- FIG. 4 is a schematic drawing showing multiple energy harvesting devices arranged in parallel to allow addition of output currents between the devices.
- FIG. 5 is a flowchart describing one method of harvesting energy from a conductor of a power distribution network.
- a monitoring system 100 comprises a plurality of energy harvesting devices 102 mounted to underground conductors 103 of an underground power distribution network. As shown, each of the conductors can have one or more energy harvesting device 102 mounted to the conductors. The energy harvesting devices 102 are connected to a single monitoring device 104 .
- the power distribution network can be a three phase AC network, or alternatively, a single-phase network, for example.
- the power distribution network can be any type of network, such as a 60 Hz North American network, or alternatively, a 50 Hz network such as is found in Europe and Asia, for example.
- the monitoring device can also be used on high voltage “transmission lines” that operate at voltages higher than 65 kV.
- the energy harvesting devices can be mounted on each power line of a three-phase network, as shown, and can be configured to generate or harvest power from the conductors to provide power for the operation of the monitoring device 104 .
- the energy harvesting devices 102 are configured to convert the changing magnetic field surrounding the distribution lines into current and/or voltage that can be rectified into DC current and used to power the monitoring devices.
- Each of the energy harvesting devices can harvest and produce an output comprising a DC current, which can then be summed in parallel at circuit element 106 to provide a single DC current input to the monitoring device 104 for operation.
- the monitoring device can be configured to monitor, among other things, current flow in the power lines and current waveforms, conductor temperatures, ambient temperatures, vibration, and monitoring device system diagnostics. In additional embodiments, multiple energy harvesting devices can be used on a single phase line.
- the monitoring device can further include wireless and or wired transmission and receiving capabilities for communication with a central server and for communications between other monitoring devices.
- the monitoring device can be configured to also measure the electric field surrounding the power lines, to record and analyze event/fault signatures, and to classify event waveforms.
- Current and electric field waveform signatures can be monitored and catalogued by the monitoring device to build a comprehensive database of events, causes, and remedial actions.
- an application executed on a central server can provide waveform and event signature cataloguing and profiling for access by the monitoring devices and by utility companies. This system can provide fault localization information with remedial action recommendations to utility companies, pre-emptive equipment failure alerts, and assist in power quality management of the distribution grid.
- FIG. 2 illustrates one embodiment of a power harvesting system 200 , which can be included in the energy harvesting devices of FIG. 1 .
- the power harvesting system is positioned in the energy harvesting devices so as to surround the power lines when the energy harvesting devices are installed.
- power harvesting system 200 can include a split core transformer 201 having first and second core halves 204 a and 204 b.
- the split core transformer can include a primary winding (not shown) comprising the power line or conductor passing through the center of the two core halves, and a harvesting coil 202 around first core half 204 a.
- the harvesting coil can be comprised, of any number of turns in order to establish the proper ‘turns ratio” required for the operation of the circuitry.
- the power harvesting system 200 may further include a second harvesting coil around the second core half 204 b (not shown).
- the current induced in the harvesting core coil supplies AC power to the electronic circuits of the monitoring device.
- the monitoring devices are designed to operate over a wide range of power grid distribution networks and operating conditions. In some embodiments, the monitoring devices are designed and configured to operate over a range of line currents between 5 amps and 800 amps.
- FIG. 3 illustrates a schematic diagram of an energy harvesting circuit 300 configured to control the harvesting of power from a power distribution network.
- the energy harvesting circuit 300 is configured to receive input(s) from an energy harvesting device, as described above. Therefore, an energy harvesting circuit can be disposed within each of the energy harvesting devices described above. Alternatively, the energy harvesting circuits can be disposed within the monitoring device described above, and electrically connected to a corresponding energy harvesting device. However, it should be understood that each energy harvesting device is coupled to its own energy harvesting circuit.
- the energy harvesting circuit 300 can receives an input voltage 302 and an input current 304 from an energy harvesting device.
- Resistors 306 represent a divider circuit configured to divide the input voltage down to a usable level for the energy harvesting circuit 300 .
- Circuit U 1 is configured to measure the input current 302 and the divided input voltage via resistors 306 .
- the circuit U 1 itself can comprise, for example, a plurality of cascading op-amps.
- the circuit U 1 (e.g., a plurality of cascading op-amps) is designed and configured to be in balance when the input voltage 302 divided by the input current 304 is a predetermined resistance value.
- the predetermined resistance is chosen to be 100 ohms to maximize the amount of current than can be extracted from the conductor(s) with the energy harvesting device(s).
- the output of circuit U 1 goes above zero or below zero depending on if the energy harvesting circuit needs to be driven more or less to achieve balance in the circuit U 1 (i.e., to achieve the predetermined resistance value). Thus, the output of circuit U 1 determines if more or less is required to achieve the desired resistance.
- the output of circuit U 1 is fed into an error amplifier 308 and pulse width modulator 310 .
- the error amplifier, pulse width modulator, boost inductor 312 , and resistor 314 are configured to add or remove a load on the circuit which therefore adjusts the resistance of the circuit to the desired predetermined level.
- the pulse width modulator operates at a certain frequency to make load of the circuit the predetermined resistance value (e.g., 100 ohms).
- the boost inductor 312 wants a constant current, so the boost inductor's output becomes the constant current.
- the amplifier US and the voltage divider formed by resistors 316 put an upper limit on the output voltage, which is set to be relatively high so as to avoid entering a voltage limit state in the circuit.
- the output current through diode 318 represents the maximum harvested current based on the operation of the circuit as described above.
- the energy harvesting circuit of the present disclosure therefore is configured to sense the output voltage of the energy harvesting device and draw a ratiometric current such that the ratio of the input voltage to the input current equates to the desired loading resistance of the energy harvesting circuit.
- the energy harvesting circuit includes a “boost” regulator and inductor which is configured to boost the input voltage to a level higher than the input.
- the schematic diagram of FIG. 3 shows how U 1 , with its inputs connected to both the input voltage and input current, will be able to maintain a constant resistance loading of the harvest device, since resistance is simply voltage divided by current.
- the output of the circuit is a current whose level is set by the available power of the harvesting device, when loaded with the constant resistance.
- the output voltage of the circuit depends on the ultimate load connected to the overall summed output. In order to limit the voltage to a practical level, U 2 will establish a certain maximum voltage.
- the output voltage and current levels of the energy harvesting circuit are not fixed, but rather are free to establish themselves at the levels demanded by the desired resistance.
- the output voltage however, must be high enough to multiple devices to add their current without hitting an upper voltage limit.
- the present disclosure further provides the ability to parallel multiple devices since the output is a current source.
- the currents directly add together, while the voltage of the paralleled circuit will depend upon the load placed upon the circuit. Heavy loads will keep the paralleled voltage low, while a light load will allow the paralleled voltage to rise to some practical upper limit. Once an upper voltage limit is reached, current sharing can no longer maintained. However, it is important to note that operation at the voltage limit infers that ample power is being harvested and the need for current sharing is no longer a priority.
- FIG. 4 is a schematic illustration of multiple energy harvesting devices 402 arranged in parallel, as described above.
- Each energy harvesting device is electrically connected to an energy harvesting circuit 400 , such as the energy harvesting circuit described above.
- the output from each energy harvesting circuit comprises a current source.
- the arrangement of FIG. 4 advantageously provides an input that looks resistive but an output that looks like a current source, which allows for multiple devices to be placed in parallel to allow the currents to directly add together. The sum of all the currents can then be fed directly to a monitoring device (as described in FIG. 1 ) to provide power for the operation of the device.
- the novelty of the present disclosure is the way the energy harvesting circuit loads the harvest device (the magnetic core and coil) with a constant resistance (its most efficient load) and then creates a “current” output, so that multiple instances can be paralleled.
- This energy harvesting circuit actively performs its current summing function only at very low currents, when it matters most. As soon as enough currents are summed so that the circuit hits the upper voltage limit (and sharing stops), the monitoring device has enough power.
- the constant resistance loading mentioned herein allows each energy harvesting core to operate at its best point of power transfer.
- FIG. 5 illustrates a flowchart that describes a method for harvesting energy from one or more conductors of a power distribution network.
- energy can be harvested from one or more conductors of a power distribution network with an energy harvesting device.
- one or more energy harvesting devices can be installed on one or more conductors of the power distribution network.
- a single harvesting device is installed on each conductor.
- more than one harvesting device can be installed on a single conductor, or on all conductors.
- the energy harvesting devices can comprise current transformers configured to induce a current proportional to the current flowing through the main conductors.
- the method can further comprise inputting the voltage and current from the energy harvesting device into an energy harvesting circuit.
- each energy harvesting device can include its own energy harvesting circuit. This circuit may be disposed within a housing of the harvesting device, or alternatively, may be located remotely from the harvesting device but be electrically coupled to the device.
- the method can further comprise drawing a ratiometric current from the energy harvesting device such that a ratio of the input voltage to the input current equals a desired loading resistance of the energy harvesting circuit.
- the ratiometric current can be outputted to a line monitoring device.
- these devices and methods can be scaled to include multiple energy harvesting devices and circuits.
- the method can include repeating these steps for additional energy harvesting devices and circuits, and summing the output currents to form a combined output current that can be used to power one or more line monitoring devices.
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Abstract
Description
- This application claims the benefit of U.S. Provisional Patent Application No. 62/732,818, filed Sep. 18, 2018, titled “Systems and Methods to Maximize Power From Multiple Power Line Energy Harvesting Devices”, the contents of which are incorporated by reference herein.
- All publications and patent applications mentioned in this specification are herein incorporated by reference to the same extent as if each individual publication or patent application was specifically and individually indicated to be incorporated by reference.
- The present application relates generally to distribution line monitoring, sensor monitoring, and power harvesting.
- Power harvesting using induction pick-up from the magnetic field surrounding a power distribution line can be used to provide power to distribution line monitoring sensors. Typically, the power line is routed through a current transformer whereby an AC signal is derived from the magnetic field induced by the AC current flow in the distribution line. The AC signal is converted to DC as part of the power harvesting process and used to power the monitoring sensors and associated electronics. This is typically referred to as “inductive harvesting using current transformers.”
- While a true current transformer is designed to provide an accurate ratio of primary to secondary current, a distribution line monitoring sensor with an energy harvesting device must also produce an adequate output voltage, and thus traditional devices typically deviates away from being an accurate current source.
- Because of the complex nature of the harvesting device's voltage, current and phase relationships, the maximum utilization of the power cannot be achieved by directly connecting multiple harvest devices in series or in parallel. Furthermore, the current levels of the individual primary conductors cannot be assumed to be precisely equal, and may in fact differ by significant amounts.
- There is a need to be able to harvest power from power distribution lines in approximate proportion to the individual primary currents.
- This disclosure generally provides distribution line monitoring sensors that include a number of features. Particularly, described herein are distribution line monitoring sensors with energy harvesting devices that are configured to maximize harvested power from power distribution lines. Additionally, described herein are distribution line monitoring sensors with energy harvesting devices that provide a constant current output characteristic to allow maximum utilization of power by connecting multiple devices in series or in parallel.
- In some embodiments, this disclosure provides for the use of multiple magnetic cores to allow for installation on differing primary conductors in a polyphase power system. This provides advantages in overall redundancy, in cases where one or more of the polyphase conductors is disconnected or has insufficient harvesting capacity. Alternately, multiple magnetic cores can be placed on the same primary conductor in order to harvest more power than fewer cores could provide.
- A method of harvesting energy from one or more conductors of a power grid distribution network is provided, comprising the steps of harvesting energy from the one or more conductors with a first energy harvesting device installed on the one or more conductors, presenting an input current and an input voltage from the first energy harvesting device to a first energy harvesting circuit, drawing a first ratiometric current from the first energy harvesting device with the first energy harvesting circuit such that a ratio of the input voltage to the input current equals a desired loading resistance of the first energy harvesting circuit.
- In one embodiment, the method can further comprise harvesting energy from the one or more conductors with a second energy harvesting device installed on the one or more conductors, presenting an input current and an input voltage from the second energy harvesting device to a second energy harvesting circuit, drawing a second ratiometric current from the second energy harvesting device with the second energy harvesting circuit such that a ratio of the input voltage to the input current equals a desired loading resistance of the second energy harvesting circuit, summing the first ratiometric current with the second ratiometric current to form a combined harvested current, and delivering the combined harvested current to a line monitoring device.
- In some embodiments, drawing the first ratiometric current further comprises adjusting a resistance of the first energy harvesting circuit to the desired loading resistance.
- In another embodiment, adjusting the resistance of the first energy harvesting circuit comprises implementing a plurality of cascading op-amps to be in balance when the input voltage divided by the input current equal the desired loading resistance.
- In some embodiments, the desired loading resistance comprises 100 ohms.
- An energy harvesting circuit configured to receive an input current and an input voltage from an energy harvesting device is also provided, comprising a drive circuit configured to provide an output indicating if a load resistance of the energy harvesting circuit is above or below a desired load resistance, and a boost regulator configured to receive the output and to adjust the input voltage to match the load resistance of the energy harvesting circuit to the desired load resistance, wherein an output of the energy harvesting circuit is an output current set by the available power of the energy harvesting device when loaded with the load resistance of the energy harvesting circuit.
- In some embodiments, the drive circuit comprises a plurality of cascading op-amps configured to be in balance when the input voltage divided by the input current equals the desired load resistance.
- In one embodiment, the desired load resistance comprises 100 ohms.
- An energy harvesting system is also provided, comprising a first energy harvesting circuit configured to receive a first input current and a first input voltage from a first energy harvesting device, the first energy harvesting circuit being configured to draw a first ratiometric current from the first energy harvesting device such that a first ratio of the first input voltage to the first input current equals a first desired loading resistance of the first energy harvesting circuit, a second energy harvesting circuit configured to receive a second input current and a second input voltage from a second energy harvesting device, the second energy harvesting circuit being configured to draw a second ratiometric current from the second energy harvesting device such that a second ratio of the second input voltage to the second input current equals a second desired loading resistance of the second energy harvesting circuit, a summation circuit configured to sum the first ratiometric current with the second ratiometric current into a combined current output, and a line monitoring device configured to receive the combined current output for operation.
- In some embodiments, the first and second energy harvestings circuits each include a plurality of cascading op-amps configured to be in balance when the input voltage divided by the input current equals the desired load resistance.
- In one embodiment, the first desired load resistance comprises 100 ohms.
- The novel features of the invention are set forth with particularity in the claims that follow. A better understanding of the features and advantages of the present invention will be obtained by reference to the following detailed description that sets forth illustrative embodiments, in which the principles of the invention are utilized, and the accompanying drawings of which:
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FIG. 1 illustrates an underground power distribution network with a plurality of harvesting devices located in close proximity to an underground enclosure. -
FIG. 2 shows the upper half of the power harvesting current transformer positioned above the lower half in what would be the closed position for normal operation. The upper and lower core halves separate with the mechanics of the housing to facilitate mounting the core on a power line. -
FIG. 3 shows an energy harvesting circuit configured to control the electrical output of an energy harvesting device and to allow for multiple instances to be paralleled. -
FIG. 4 is a schematic drawing showing multiple energy harvesting devices arranged in parallel to allow addition of output currents between the devices. -
FIG. 5 is a flowchart describing one method of harvesting energy from a conductor of a power distribution network. - Power line monitoring devices and systems described herein are configured to measure the currents and voltages of power grid distribution networks. Referring to
FIG. 1 , amonitoring system 100 comprises a plurality ofenergy harvesting devices 102 mounted tounderground conductors 103 of an underground power distribution network. As shown, each of the conductors can have one or moreenergy harvesting device 102 mounted to the conductors. Theenergy harvesting devices 102 are connected to asingle monitoring device 104. The power distribution network can be a three phase AC network, or alternatively, a single-phase network, for example. The power distribution network can be any type of network, such as a 60 Hz North American network, or alternatively, a 50 Hz network such as is found in Europe and Asia, for example. The monitoring device can also be used on high voltage “transmission lines” that operate at voltages higher than 65 kV. - The energy harvesting devices can be mounted on each power line of a three-phase network, as shown, and can be configured to generate or harvest power from the conductors to provide power for the operation of the
monitoring device 104. Theenergy harvesting devices 102 are configured to convert the changing magnetic field surrounding the distribution lines into current and/or voltage that can be rectified into DC current and used to power the monitoring devices. Each of the energy harvesting devices can harvest and produce an output comprising a DC current, which can then be summed in parallel atcircuit element 106 to provide a single DC current input to themonitoring device 104 for operation. - The monitoring device can be configured to monitor, among other things, current flow in the power lines and current waveforms, conductor temperatures, ambient temperatures, vibration, and monitoring device system diagnostics. In additional embodiments, multiple energy harvesting devices can be used on a single phase line. The monitoring device can further include wireless and or wired transmission and receiving capabilities for communication with a central server and for communications between other monitoring devices.
- The monitoring device can be configured to also measure the electric field surrounding the power lines, to record and analyze event/fault signatures, and to classify event waveforms. Current and electric field waveform signatures can be monitored and catalogued by the monitoring device to build a comprehensive database of events, causes, and remedial actions. In some embodiments, an application executed on a central server can provide waveform and event signature cataloguing and profiling for access by the monitoring devices and by utility companies. This system can provide fault localization information with remedial action recommendations to utility companies, pre-emptive equipment failure alerts, and assist in power quality management of the distribution grid.
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FIG. 2 illustrates one embodiment of apower harvesting system 200, which can be included in the energy harvesting devices ofFIG. 1 . In some embodiments, the power harvesting system is positioned in the energy harvesting devices so as to surround the power lines when the energy harvesting devices are installed. - Referring to
FIG. 2 ,power harvesting system 200 can include a splitcore transformer 201 having first andsecond core halves harvesting coil 202 aroundfirst core half 204 a. The harvesting coil can be comprised, of any number of turns in order to establish the proper ‘turns ratio” required for the operation of the circuitry. Thepower harvesting system 200 may further include a second harvesting coil around the secondcore half 204 b (not shown). - The current induced in the harvesting core coil supplies AC power to the electronic circuits of the monitoring device. In general, the monitoring devices are designed to operate over a wide range of power grid distribution networks and operating conditions. In some embodiments, the monitoring devices are designed and configured to operate over a range of line currents between 5 amps and 800 amps.
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FIG. 3 illustrates a schematic diagram of anenergy harvesting circuit 300 configured to control the harvesting of power from a power distribution network. Theenergy harvesting circuit 300 is configured to receive input(s) from an energy harvesting device, as described above. Therefore, an energy harvesting circuit can be disposed within each of the energy harvesting devices described above. Alternatively, the energy harvesting circuits can be disposed within the monitoring device described above, and electrically connected to a corresponding energy harvesting device. However, it should be understood that each energy harvesting device is coupled to its own energy harvesting circuit. - The
energy harvesting circuit 300 can receives aninput voltage 302 and an input current 304 from an energy harvesting device.Resistors 306 represent a divider circuit configured to divide the input voltage down to a usable level for theenergy harvesting circuit 300. Circuit U1 is configured to measure the input current 302 and the divided input voltage viaresistors 306. The circuit U1 itself can comprise, for example, a plurality of cascading op-amps. The circuit U1 (e.g., a plurality of cascading op-amps) is designed and configured to be in balance when theinput voltage 302 divided by the input current 304 is a predetermined resistance value. In one example the predetermined resistance is chosen to be 100 ohms to maximize the amount of current than can be extracted from the conductor(s) with the energy harvesting device(s). The output of circuit U1 goes above zero or below zero depending on if the energy harvesting circuit needs to be driven more or less to achieve balance in the circuit U1 (i.e., to achieve the predetermined resistance value). Thus, the output of circuit U1 determines if more or less is required to achieve the desired resistance. - The output of circuit U1 is fed into an
error amplifier 308 andpulse width modulator 310. The error amplifier, pulse width modulator,boost inductor 312, andresistor 314 are configured to add or remove a load on the circuit which therefore adjusts the resistance of the circuit to the desired predetermined level. For example, the pulse width modulator operates at a certain frequency to make load of the circuit the predetermined resistance value (e.g., 100 ohms). Theboost inductor 312 wants a constant current, so the boost inductor's output becomes the constant current. The amplifier US and the voltage divider formed byresistors 316 put an upper limit on the output voltage, which is set to be relatively high so as to avoid entering a voltage limit state in the circuit. The output current through diode 318 represents the maximum harvested current based on the operation of the circuit as described above. - Because of the output characteristics of the energy harvesting circuit, having neither a fixed output voltage, nor fixed output current, the maximum obtainable power will be delivered when the load resistance equals the equivalent source resistance of the energy harvesting circuit. This is in accordance with the “Maximum Power Transfer Theorem”. The energy harvesting circuit of the present disclosure therefore is configured to sense the output voltage of the energy harvesting device and draw a ratiometric current such that the ratio of the input voltage to the input current equates to the desired loading resistance of the energy harvesting circuit.
- The energy harvesting circuit includes a “boost” regulator and inductor which is configured to boost the input voltage to a level higher than the input. The schematic diagram of
FIG. 3 shows how U1, with its inputs connected to both the input voltage and input current, will be able to maintain a constant resistance loading of the harvest device, since resistance is simply voltage divided by current. The output of the circuit is a current whose level is set by the available power of the harvesting device, when loaded with the constant resistance. The output voltage of the circuit depends on the ultimate load connected to the overall summed output. In order to limit the voltage to a practical level, U2 will establish a certain maximum voltage. - As noted above, the output voltage and current levels of the energy harvesting circuit are not fixed, but rather are free to establish themselves at the levels demanded by the desired resistance. The output voltage however, must be high enough to multiple devices to add their current without hitting an upper voltage limit.
- The present disclosure further provides the ability to parallel multiple devices since the output is a current source. When paralleling current sources, the currents directly add together, while the voltage of the paralleled circuit will depend upon the load placed upon the circuit. Heavy loads will keep the paralleled voltage low, while a light load will allow the paralleled voltage to rise to some practical upper limit. Once an upper voltage limit is reached, current sharing can no longer maintained. However, it is important to note that operation at the voltage limit infers that ample power is being harvested and the need for current sharing is no longer a priority.
-
FIG. 4 is a schematic illustration of multipleenergy harvesting devices 402 arranged in parallel, as described above. Each energy harvesting device is electrically connected to anenergy harvesting circuit 400, such as the energy harvesting circuit described above. The output from each energy harvesting circuit comprises a current source. The arrangement ofFIG. 4 advantageously provides an input that looks resistive but an output that looks like a current source, which allows for multiple devices to be placed in parallel to allow the currents to directly add together. The sum of all the currents can then be fed directly to a monitoring device (as described inFIG. 1 ) to provide power for the operation of the device. - The novelty of the present disclosure is the way the energy harvesting circuit loads the harvest device (the magnetic core and coil) with a constant resistance (its most efficient load) and then creates a “current” output, so that multiple instances can be paralleled. This energy harvesting circuit actively performs its current summing function only at very low currents, when it matters most. As soon as enough currents are summed so that the circuit hits the upper voltage limit (and sharing stops), the monitoring device has enough power. The constant resistance loading mentioned herein, allows each energy harvesting core to operate at its best point of power transfer.
-
FIG. 5 illustrates a flowchart that describes a method for harvesting energy from one or more conductors of a power distribution network. At anoperation 502, energy can be harvested from one or more conductors of a power distribution network with an energy harvesting device. As described above, one or more energy harvesting devices can be installed on one or more conductors of the power distribution network. In some examples, a single harvesting device is installed on each conductor. In other embodiments, more than one harvesting device can be installed on a single conductor, or on all conductors. The energy harvesting devices can comprise current transformers configured to induce a current proportional to the current flowing through the main conductors. - At an
operation 504, the method can further comprise inputting the voltage and current from the energy harvesting device into an energy harvesting circuit. As described above, each energy harvesting device can include its own energy harvesting circuit. This circuit may be disposed within a housing of the harvesting device, or alternatively, may be located remotely from the harvesting device but be electrically coupled to the device. - At an
operation 506, the method can further comprise drawing a ratiometric current from the energy harvesting device such that a ratio of the input voltage to the input current equals a desired loading resistance of the energy harvesting circuit. Atoperation 508, the ratiometric current can be outputted to a line monitoring device. - As described above, these devices and methods can be scaled to include multiple energy harvesting devices and circuits. Thus, in
steps - As for additional details pertinent to the present invention, materials and manufacturing techniques may be employed as within the level of those with skill in the relevant art. The same may hold true with respect to method-based aspects of the invention in terms of additional acts commonly or logically employed. Also, it is contemplated that any optional feature of the inventive variations described may be set forth and claimed independently, or in combination with any one or more of the features described herein. Likewise, reference to a singular item, includes the possibility that there are plural of the same items present. More specifically, as used herein and in the appended claims, the singular forms “a,” “and,” “said,” and “the” include plural referents unless the context clearly dictates otherwise. It is further noted that the claims may be drafted to exclude any optional element. As such, this statement is intended to serve as antecedent basis for use of such exclusive terminology as “solely,” “only” and the like in connection with the recitation of claim elements, or use of a “negative” limitation. Unless defined otherwise herein, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The breadth of the present invention is not to be limited by the subject specification, but rather only by the plain meaning of the claim terms employed.
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2021229113A1 (en) * | 2020-05-15 | 2021-11-18 | Asociacion Centro Tecnologico Ceit | System for the capture and storage of electrical energy |
US11549997B2 (en) | 2018-12-13 | 2023-01-10 | Sentient Technology Holdings, LLC | Multi-phase simulation environment |
US11789042B2 (en) | 2012-01-03 | 2023-10-17 | Sentient Technology Holdings, LLC | Energy harvest split core design elements for ease of installation, high performance, and long term reliability |
US11947374B2 (en) | 2019-02-04 | 2024-04-02 | Sentient Technology Holdings, LLC | Power supply for electric utility underground equipment |
Family Cites Families (188)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3075166A (en) | 1959-09-08 | 1963-01-22 | Anderson Electric Corp | Hot line clamp |
GB1207323A (en) | 1967-05-23 | 1970-09-30 | English Electric Co Ltd | A.c. system fault indicator |
US3816816A (en) | 1969-11-03 | 1974-06-11 | Schweitzer Mfg Co E | Indicating and automatically resettable system for detection of fault current flow in a conductor |
US3768011A (en) | 1970-06-09 | 1973-10-23 | W Swain | Means for measuring magnitude and direction of a direct current or permanent magnet, including clip-on direct current sensing inductor |
US3720872A (en) | 1970-09-04 | 1973-03-13 | Taft Electrosyst Inc | Power transmission fault indicator with automatic reset means |
CH530101A (en) | 1970-11-27 | 1972-10-31 | Siemens Ag | Metal-enclosed high-voltage line |
US3702966A (en) | 1971-03-01 | 1972-11-14 | Schweitzer Mfg Co E | Current measuring and automatically resettable fault indicating means |
US3686531A (en) | 1971-04-08 | 1972-08-22 | Robert M Decker | Fault locating system for electrical circuits |
US3715742A (en) | 1971-06-01 | 1973-02-06 | Schweiter E Mfg Co Inc | Alternating current fault indicating means |
US3676740A (en) | 1971-06-01 | 1972-07-11 | Schweitzer Mfg Co E | Automatically resettable fault indicator |
US3725832A (en) | 1971-10-12 | 1973-04-03 | Schwertzer E Mfg Co Inc | Magnetic core structure |
US3755714A (en) | 1971-12-20 | 1973-08-28 | Rte Corp | Self-contained interrupting apparatus for an electric power distribution system |
US3777217A (en) | 1972-01-10 | 1973-12-04 | L Groce | Fault indicator apparatus for fault location in an electrical power distribution system |
US3708724A (en) | 1972-03-31 | 1973-01-02 | Schweitzer Mfg Co E | Signalling system responsive to fault on electric power line |
CH583980A5 (en) | 1973-11-23 | 1977-01-14 | Zellweger Uster Ag | |
US3866197A (en) | 1973-12-10 | 1975-02-11 | E O Schweitzer Manufacturing C | Means for detecting fault current in a conductor and indicating same at a remote point |
US3876911A (en) | 1974-02-11 | 1975-04-08 | Schweitzer Mfg Co E | Fault indicator system for high voltage connectors |
US3957329A (en) | 1974-11-01 | 1976-05-18 | I-T-E Imperial Corporation | Fault-current limiter for high power electrical transmission systems |
US4063161A (en) | 1975-04-14 | 1977-12-13 | Joslyn Mfg. And Supply Co. | Buried cable fault locator with earth potential indicator and pulse generator |
US4161761A (en) * | 1977-09-06 | 1979-07-17 | Mcgraw-Edison Company | Proportional ground current relay |
US4152643A (en) | 1978-04-10 | 1979-05-01 | E. O. Schweitzer Manufacturing Co., Inc. | Voltage indicating test point cap |
JPS55138215A (en) | 1979-04-12 | 1980-10-28 | Sony Corp | Power supply device |
US4378525A (en) | 1980-09-18 | 1983-03-29 | Burdick Neal M | Method and apparatus for measuring a DC current in a wire without making a direct connection to the wire |
US4408155A (en) | 1981-03-02 | 1983-10-04 | Bridges Electric, Inc. | Fault detector with improved response time for electrical transmission system |
US4396794A (en) | 1981-03-30 | 1983-08-02 | Westinghouse Electric Corp. | Arc protection clamp and arrangement for covered overhead power distribution lines |
US4398057A (en) | 1981-03-30 | 1983-08-09 | Westinghouse Electric Corp. | Arc protection arrangement for covered overhead power distribution lines |
US4466071A (en) | 1981-09-28 | 1984-08-14 | Texas A&M University System | High impedance fault detection apparatus and method |
SE433405B (en) | 1982-09-14 | 1984-05-21 | Asea Ab | PROCEDURE AND DEVICE FOR LOCATING A FAILURE ON A THREE-PHASE POWER CORD |
US4396968A (en) | 1982-09-22 | 1983-08-02 | Westinghouse Electric Corp. | Fused distribution power system with clamp device for preventing arc damage to insulated distribution conductors |
US4709339A (en) | 1983-04-13 | 1987-11-24 | Fernandes Roosevelt A | Electrical power line parameter measurement apparatus and systems, including compact, line-mounted modules |
US4746241A (en) | 1983-04-13 | 1988-05-24 | Niagara Mohawk Power Corporation | Hinge clamp for securing a sensor module on a power transmission line |
US4714893A (en) | 1983-04-13 | 1987-12-22 | Niagara Mohawk Power Corporation | Apparatus for measuring the potential of a transmission line conductor |
US4723220A (en) | 1983-04-13 | 1988-02-02 | Niagara Mohawk Power Corporation | Apparatus for power measuring and calculating Fourier components of power line parameters |
US4829298A (en) | 1983-04-13 | 1989-05-09 | Fernandes Roosevelt A | Electrical power line monitoring systems, including harmonic value measurements and relaying communications |
US4584523A (en) | 1983-10-03 | 1986-04-22 | Rca Corporation | Measurement of the current flow in an electric power transmission line by detection of infrared radiation therefrom |
US4570231A (en) | 1984-01-27 | 1986-02-11 | Richard H. Bunch | Fault finder |
US4649457A (en) | 1984-02-17 | 1987-03-10 | B. H. Tytewadd Marketing, Incorporated | Surge protection device |
US4728887A (en) | 1984-06-22 | 1988-03-01 | Davis Murray W | System for rating electric power transmission lines and equipment |
US5495169A (en) | 1984-10-12 | 1996-02-27 | Smith; Dayle | Clamp-on current sensor |
US4766549A (en) | 1984-11-30 | 1988-08-23 | Electric Power Research Institute, Inc. | Single-ended transmission line fault locator |
US4654573A (en) | 1985-05-17 | 1987-03-31 | Flexible Manufacturing Systems, Inc. | Power transfer device |
CH668487A5 (en) | 1985-05-21 | 1988-12-30 | Korona Messtechnik Gossau | CONTROL DEVICE FOR THE ELECTRONIC DETECTION OF DEFECTS THAT CAUSE ENERGY LOSSES IN AC POWER CABLES. |
US4886980A (en) | 1985-11-05 | 1989-12-12 | Niagara Mohawk Power Corporation | Transmission line sensor apparatus operable with near zero current line conditions |
US4808916A (en) | 1986-11-14 | 1989-02-28 | Niagara Mohawk Power Corporation | Power supply magnetic shunt for transmission line sensor module |
US4904932A (en) | 1987-06-16 | 1990-02-27 | E. O. Schweitzer Manufacturing Co., Inc. | Circuit condition monitor with integrally molded test point socket and capacitive coupling |
US5006846A (en) | 1987-11-12 | 1991-04-09 | Granville J Michael | Power transmission line monitoring system |
US4881028A (en) | 1988-06-13 | 1989-11-14 | Bright James A | Fault detector |
US4937769A (en) | 1988-06-15 | 1990-06-26 | Asea Brown Boveri Inc. | Apparatus and method for reducing transient exponential noise in a sinusoidal signal |
US5202812A (en) | 1988-09-21 | 1993-04-13 | Ngk Insulators, Ltd. | Apparatus for detecting faults on power transmission lines |
US5138265A (en) | 1988-11-30 | 1992-08-11 | Sumitomo Electric Industries, Ltd. | Apparatus and system for locating thunderstruck point and faulty point of transmission line |
US5125738A (en) | 1988-12-13 | 1992-06-30 | Sumitomo Electric Industries, Ltd. | Apparatus and system for locating a point or a faulty point in a transmission line |
GB2231216B (en) | 1989-04-05 | 1993-04-14 | Mitsubishi Electric Corp | Zero-phase sequence current detector |
US5181026A (en) | 1990-01-12 | 1993-01-19 | Granville Group, Inc., The | Power transmission line monitoring system |
US5182547A (en) | 1991-01-16 | 1993-01-26 | High Voltage Maintenance | Neutral wire current monitoring for three-phase four-wire power distribution system |
US5220311A (en) | 1991-02-19 | 1993-06-15 | Schweitzer Edmund O Jun | Direction indicating fault indicators |
US5206595A (en) | 1991-09-10 | 1993-04-27 | Electric Power Research Institute | Advanced cable fault location |
FR2693275B1 (en) | 1992-07-06 | 1994-08-19 | Alsthom Gec | Ground measurement device for high voltage overhead lines. |
US5473244A (en) | 1992-09-17 | 1995-12-05 | Libove; Joel M. | Apparatus for measuring voltages and currents using non-contacting sensors |
US5428549A (en) | 1993-05-28 | 1995-06-27 | Abb Power T&D Company | Transmission line fault location system |
US5519560A (en) * | 1994-03-01 | 1996-05-21 | Eaton Corporation | Unity gain filter for current transformer |
AU684945B2 (en) | 1994-04-25 | 1998-01-08 | Foster-Miller Inc. | Self-powered powerline sensor |
JP3058564B2 (en) | 1994-07-14 | 2000-07-04 | 東京電力株式会社 | Transmission line failure section and failure mode evaluation method |
US5550476A (en) | 1994-09-29 | 1996-08-27 | Pacific Gas And Electric Company | Fault sensor device with radio transceiver |
US5737203A (en) | 1994-10-03 | 1998-04-07 | Delco Electronics Corp. | Controlled-K resonating transformer |
US5608328A (en) | 1994-11-18 | 1997-03-04 | Radar Engineers | Method and apparatus for pin-pointing faults in electric power lines |
US5656931A (en) | 1995-01-20 | 1997-08-12 | Pacific Gas And Electric Company | Fault current sensor device with radio transceiver |
US5650728A (en) | 1995-04-03 | 1997-07-22 | Hubbell Incorporated | Fault detection system including a capacitor for generating a pulse and a processor for determining admittance versus frequency of a reflected pulse |
US5600248A (en) | 1995-06-21 | 1997-02-04 | Dipl.-Ing H. Horstmann Gmbh | Fault distance locator for underground cable circuits |
US5682100A (en) | 1995-09-06 | 1997-10-28 | Electric Power Research Institute Inc. | System and method for locating faults in electric power cables |
KR0168922B1 (en) | 1995-12-26 | 1999-02-01 | 양승택 | Trouble location detection apparatus in system having multi asic |
US5729144A (en) | 1996-12-02 | 1998-03-17 | Cummins; Kenneth L. | Systems and methods for determining location of a fault on an electric utility power distribution system |
US5990674A (en) | 1996-07-08 | 1999-11-23 | E.O. Schweitzer Manfacturing Co., Inc. | Clamping mechanism for mounting circuit condition monitoring devices on cables of various diameters |
US5764065A (en) | 1996-09-20 | 1998-06-09 | Richards; Clyde N. | Remote contamination sensing device for determining contamination on insulation of power lines and substations |
US7158012B2 (en) | 1996-11-01 | 2007-01-02 | Foster-Miller, Inc. | Non-invasive powerline communications system |
SE9604814D0 (en) | 1996-12-20 | 1996-12-20 | Scanditronix Medical Ab | Power modulator |
US5839093A (en) | 1996-12-31 | 1998-11-17 | Abb Transmit Oy | System for locating faults and estimating fault resistance in distribution networks with tapped loads |
IES970641A2 (en) | 1997-08-28 | 1999-02-24 | Electricity Supply Board | Fault detection apparatus and method of detecting faults in an electrical distribution network |
US6002260A (en) | 1997-09-23 | 1999-12-14 | Pacific Gas & Electric Company | Fault sensor suitable for use in heterogenous power distribution systems |
US6798211B1 (en) | 1997-10-30 | 2004-09-28 | Remote Monitoring Systems, Inc. | Power line fault detector and analyzer |
US6347027B1 (en) | 1997-11-26 | 2002-02-12 | Energyline Systems, Inc. | Method and apparatus for automated reconfiguration of an electric power distribution system with enhanced protection |
US6043433A (en) | 1998-02-20 | 2000-03-28 | E.O. Schweitzer Manufacturing Co., Inc. | Cable clamp with universal positioning |
US6566854B1 (en) | 1998-03-13 | 2003-05-20 | Florida International University | Apparatus for measuring high frequency currents |
US6016105A (en) | 1998-04-30 | 2000-01-18 | E.O. Schweitzer Manufacturing Co., Inc. | Fault indicator providing contact closure and light indication on fault detection |
US6433698B1 (en) | 1998-04-30 | 2002-08-13 | E.O. Schweitzer Mfg. Co. | Fault indicator providing light indication on fault detection |
US6133724A (en) | 1998-06-29 | 2000-10-17 | E. O. Schweitzer Manufacturing Co. | Remote light indication fault indicator with a timed reset circuit and a manual reset circuit |
US6133723A (en) | 1998-06-29 | 2000-10-17 | E. O. Schweitzer Manufacturing Co. | Fault indicator having remote light indication of fault detection |
TW526335B (en) | 1998-11-12 | 2003-04-01 | Nippon Kouatsu Electric Co Ltd | Fault point location system |
GB2345810B (en) | 1999-01-13 | 2003-07-23 | Alstom Uk Ltd | Fault-detection apparatus |
US6677743B1 (en) | 1999-03-05 | 2004-01-13 | Foster-Miller, Inc. | High voltage powerline sensor with a plurality of voltage sensing devices |
US6292340B1 (en) | 1999-04-09 | 2001-09-18 | Electrical Materials Company | Apparatus for isolation of high impedance faults |
US6459998B1 (en) | 1999-07-24 | 2002-10-01 | Gary R. Hoffman | Sensing downed power lines |
US6549880B1 (en) | 1999-09-15 | 2003-04-15 | Mcgraw Edison Company | Reliability of electrical distribution networks |
MXPA02005243A (en) | 1999-11-24 | 2003-01-28 | American Superconductor Corp | Voltage regulation of a utility power network. |
US6288632B1 (en) | 1999-12-20 | 2001-09-11 | General Electric Company | Apparatus and method for power line communication (PLC) |
SE522376C2 (en) | 2000-07-11 | 2004-02-03 | Abb Ab | Method and device for fault location for distribution networks |
US6559651B1 (en) | 2000-10-25 | 2003-05-06 | Robert G. Crick | Method for locating an open in a conductive line of an insulated conductor |
US6622285B1 (en) | 2000-11-02 | 2003-09-16 | Hewlett-Packard Development Company, L.P. | Methods and systems for fault location |
US6466030B2 (en) | 2000-12-29 | 2002-10-15 | Abb Power Automation Ltd. | Systems and methods for locating faults on a transmission line with a single tapped load |
US6466031B1 (en) | 2000-12-29 | 2002-10-15 | Abb Power Automation Ltd. | Systems and methods for locating faults on a transmission line with multiple tapped loads |
WO2002101952A1 (en) | 2001-06-12 | 2002-12-19 | Main.Net Communications Ltd. | Coupling circuits for power line communications |
US6822576B1 (en) | 2001-10-26 | 2004-11-23 | E.O. Schweitzer Manufacturing Company, Inc. | Microprocessor controlled fault detector with circuit overload condition detection |
US7053601B1 (en) | 2001-10-26 | 2006-05-30 | E.O. Schweitzer Mfg. Co. | Microprocessor controlled fault indicator having high visibility LED fault indication |
US7023691B1 (en) | 2001-10-26 | 2006-04-04 | E.O. Schweitzer Mfg. Llc | Fault Indicator with permanent and temporary fault indication |
US6734662B1 (en) | 2001-10-26 | 2004-05-11 | E.O. Schweitzer Manufacturing Co., Inc. | Microprocessor controlled fault indicator having led fault indication circuit with battery conservation mode |
US6894478B1 (en) | 2001-10-26 | 2005-05-17 | E.O. Schweitzer Manufacturing Company, Inc. | Fault indicator with automatically configured trip settings |
US6949921B1 (en) | 2001-10-26 | 2005-09-27 | E.O. Schweitzer Manufacturing Co., Llc | Auto-calibration of multiple trip settings in a fault indicator |
US6914763B2 (en) | 2002-01-15 | 2005-07-05 | Wellspring Heritage, Llc | Utility control and autonomous disconnection of distributed generation from a power distribution system |
AU2003234448A1 (en) | 2002-05-06 | 2003-11-11 | Enikia Llc | Method and system for power line network fault detection and quality monitoring |
US6756776B2 (en) | 2002-05-28 | 2004-06-29 | Amperion, Inc. | Method and device for installing and removing a current transformer on and from a current-carrying power line |
US6963197B1 (en) | 2002-05-31 | 2005-11-08 | E.O. Schweitzer Manufacturing Co., Llc. | Targeted timed reset fault indicator |
US6879917B2 (en) | 2002-06-14 | 2005-04-12 | Progress Energy Carolinas Inc. | Double-ended distance-to-fault location system using time-synchronized positive-or negative-sequence quantities |
US7076378B1 (en) | 2002-11-13 | 2006-07-11 | Current Technologies, Llc | Device and method for providing power line characteristics and diagnostics |
US7075414B2 (en) | 2003-05-13 | 2006-07-11 | Current Technologies, Llc | Device and method for communicating data signals through multiple power line conductors |
US6980090B2 (en) | 2002-12-10 | 2005-12-27 | Current Technologies, Llc | Device and method for coupling with electrical distribution network infrastructure to provide communications |
US7272516B2 (en) | 2002-12-23 | 2007-09-18 | Abb Research | Failure rate adjustment for electric power network reliability analysis |
US7203622B2 (en) | 2002-12-23 | 2007-04-10 | Abb Research Ltd. | Value-based transmission asset maintenance management of electric power networks |
US7046124B2 (en) | 2003-01-21 | 2006-05-16 | Current Technologies, Llc | Power line coupling device and method of using the same |
AU2003202128A1 (en) | 2003-01-31 | 2004-08-23 | Fmc Tech Limited | A monitoring device for a medium voltage overhead line |
US7177125B2 (en) | 2003-02-12 | 2007-02-13 | Honeywell International Inc. | Arc fault detection for SSPC based electrical power distribution systems |
US6822457B2 (en) | 2003-03-27 | 2004-11-23 | Marshall B. Borchert | Method of precisely determining the location of a fault on an electrical transmission system |
US7321291B2 (en) | 2004-10-26 | 2008-01-22 | Current Technologies, Llc | Power line communications system and method of operating the same |
US7742393B2 (en) | 2003-07-24 | 2010-06-22 | Hunt Technologies, Inc. | Locating endpoints in a power line communication system |
US7105952B2 (en) | 2003-10-03 | 2006-09-12 | Soft Switching Technologies Corporation | Distributed floating series active impendances for power transmission systems |
CN101023366B (en) | 2004-06-04 | 2011-01-19 | Fmc技术有限公司 | A method of monitoring line faults in a medium voltage network |
US7400150B2 (en) | 2004-08-05 | 2008-07-15 | Cannon Technologies, Inc. | Remote fault monitoring in power lines |
US7085659B2 (en) | 2004-10-15 | 2006-08-01 | Abb Technology Ag | Dynamic energy threshold calculation for high impedance fault detection |
US7072163B2 (en) | 2004-10-19 | 2006-07-04 | Mccollough Jr Norman D | Method and apparatus for a remote electric power line conductor faulted circuit current monitoring system |
US7187275B2 (en) | 2004-10-21 | 2007-03-06 | Mccollough Jr Norman D | Method and apparatus for a remote electric power line conductor faulted circuit current, conductor temperature, conductor potential and conductor strain monitoring and alarm system |
CN101061386B (en) | 2004-10-22 | 2012-08-08 | 地下系统公司 | Power supply and communications controller |
US7295133B1 (en) | 2004-12-30 | 2007-11-13 | Hendrix Wire & Cable, Inc. | Electrical circuit monitoring device |
WO2006078944A2 (en) | 2005-01-19 | 2006-07-27 | Power Measurement Ltd. | Sensor apparatus |
US7633262B2 (en) | 2005-03-11 | 2009-12-15 | Lindsey Manufacturing Company | Power supply for underground and pad mounted power distribution systems |
EP1938159B1 (en) | 2005-09-16 | 2016-08-24 | Ampacimon S.A. | Device, system and method for real-time monitoring of overhead power lines |
US7626794B2 (en) | 2005-10-18 | 2009-12-01 | Schweitzer Engineering Laboratories, Inc. | Systems, methods, and apparatus for indicating faults within a power circuit utilizing dynamically modified inrush restraint |
US7508638B2 (en) | 2006-02-28 | 2009-03-24 | Siemens Energy & Automation, Inc. | Devices, systems, and methods for providing electrical power |
WO2007109555A2 (en) | 2006-03-16 | 2007-09-27 | Power Monitors, Inc. | Underground monitoring system and method |
US7764943B2 (en) | 2006-03-27 | 2010-07-27 | Current Technologies, Llc | Overhead and underground power line communication system and method using a bypass |
US7532012B2 (en) | 2006-07-07 | 2009-05-12 | Ambient Corporation | Detection and monitoring of partial discharge of a power line |
US7683798B2 (en) | 2006-07-07 | 2010-03-23 | Ssi Power, Llc | Current monitoring device for high voltage electric power lines |
US7720619B2 (en) | 2006-08-04 | 2010-05-18 | Schweitzer Engineering Laboratories, Inc. | Systems and methods for detecting high-impedance faults in a multi-grounded power distribution system |
US20080077336A1 (en) | 2006-09-25 | 2008-03-27 | Roosevelt Fernandes | Power line universal monitor |
US7725295B2 (en) | 2006-11-01 | 2010-05-25 | Abb Research Ltd. | Cable fault detection |
US7672812B2 (en) | 2006-11-01 | 2010-03-02 | Abb Research Ltd. | Cable fault detection |
US7795877B2 (en) | 2006-11-02 | 2010-09-14 | Current Technologies, Llc | Power line communication and power distribution parameter measurement system and method |
US7804280B2 (en) | 2006-11-02 | 2010-09-28 | Current Technologies, Llc | Method and system for providing power factor correction in a power distribution system |
US7795994B2 (en) | 2007-06-26 | 2010-09-14 | Current Technologies, Llc | Power line coupling device and method |
ATE507605T1 (en) | 2007-08-31 | 2011-05-15 | Abb Technology Ag | METHOD AND DEVICE FOR COMPENSATING AN ASYMMETRIC DC BIAS CURRENT IN A POWER TRANSFORMER CONNECTED TO A HIGH VOLTAGE CONVERTER |
US20090058582A1 (en) | 2007-09-04 | 2009-03-05 | Webb Thomas A | Systems and methods for extracting net-positive work from magnetic forces |
US8594956B2 (en) | 2007-11-02 | 2013-11-26 | Cooper Technologies Company | Power line energy harvesting power supply |
US7930141B2 (en) | 2007-11-02 | 2011-04-19 | Cooper Technologies Company | Communicating faulted circuit indicator apparatus and method of use thereof |
US9383394B2 (en) | 2007-11-02 | 2016-07-05 | Cooper Technologies Company | Overhead communicating device |
US7714592B2 (en) | 2007-11-07 | 2010-05-11 | Current Technologies, Llc | System and method for determining the impedance of a medium voltage power line |
US7586380B1 (en) * | 2008-03-12 | 2009-09-08 | Kawasaki Microelectronics, Inc. | Bias circuit to stabilize oscillation in ring oscillator, oscillator, and method to stabilize oscillation in ring oscillator |
US20090309754A1 (en) | 2008-06-16 | 2009-12-17 | Jimmy Bou | Wireless current transformer |
US8421444B2 (en) | 2009-12-31 | 2013-04-16 | Schneider Electric USA, Inc. | Compact, two stage, zero flux electronically compensated current or voltage transducer employing dual magnetic cores having substantially dissimilar magnetic characteristics |
EP2603804A1 (en) | 2010-08-10 | 2013-06-19 | Cooper Technologies Company | Apparatus for mounting an overhead monitoring device |
US9697724B2 (en) | 2010-09-22 | 2017-07-04 | Hubbell Incorporated | Transmission line measuring device and method for connectivity and monitoring |
US20120081824A1 (en) * | 2010-09-29 | 2012-04-05 | Krishnaswamy Gururaj Narendra | Method and apparatus for sub-harmonic protection |
WO2012078652A1 (en) | 2010-12-06 | 2012-06-14 | Sentient Energy, Inc. | Power conductor monitoring device and method of calibration |
US8437157B2 (en) | 2011-03-16 | 2013-05-07 | Marmon Utility, Llc | Power line current fed power supplies producing stable load currents and related methods |
AU2011369885B2 (en) | 2011-05-30 | 2015-07-23 | Abb Schweiz Ag | System for distributing electric power to an electrical grid |
TWI458241B (en) * | 2011-09-23 | 2014-10-21 | Richtek Technology Corp | Power supply with dynamic dropout control and method thereof |
WO2013122633A1 (en) | 2011-10-18 | 2013-08-22 | Baldwin David A | Arc devices and moving arc couples |
JP5766299B2 (en) | 2011-12-05 | 2015-08-19 | 三菱電機株式会社 | Signal transmission circuit |
EP2611028A1 (en) * | 2011-12-30 | 2013-07-03 | Dialog Semiconductor GmbH | Multi-stage fully differential amplifier with controlled common mode voltage |
US9229036B2 (en) | 2012-01-03 | 2016-01-05 | Sentient Energy, Inc. | Energy harvest split core design elements for ease of installation, high performance, and long term reliability |
US9182429B2 (en) | 2012-01-04 | 2015-11-10 | Sentient Energy, Inc. | Distribution line clamp force using DC bias on coil |
US8847576B1 (en) * | 2012-08-30 | 2014-09-30 | Continental Control Systems, Llc | Phase compensation method and apparatus for current transformers |
US9198500B2 (en) | 2012-12-21 | 2015-12-01 | Murray W. Davis | Portable self powered line mountable electric power line and environment parameter monitoring transmitting and receiving system |
US20140192458A1 (en) | 2013-01-04 | 2014-07-10 | General Electric Company | Power distribution systems and methods of operating a power distribution system including arc flash detection |
US20150372626A1 (en) * | 2013-01-11 | 2015-12-24 | Aktiebolaget Skf | Voltage adjustment for an energy harvester |
US9366688B2 (en) | 2013-03-14 | 2016-06-14 | Hubbell Incorporated | Apparatuses, systems and methods for determining effective wind speed |
US9983244B2 (en) * | 2013-06-28 | 2018-05-29 | Honeywell International Inc. | Power transformation system with characterization |
US10811892B2 (en) * | 2013-06-28 | 2020-10-20 | Ademco Inc. | Source management for a power transformation system |
US11054448B2 (en) * | 2013-06-28 | 2021-07-06 | Ademco Inc. | Power transformation self characterization mode |
US20180287370A1 (en) * | 2013-09-26 | 2018-10-04 | James J. Kinsella | Low-cost, full-range electronc overload relay device |
US9551752B2 (en) | 2014-01-16 | 2017-01-24 | Vanguard Instruments Company, Inc. | Dual ground breaker testing system |
KR101459336B1 (en) * | 2014-03-04 | 2014-11-07 | (주)테라에너지시스템 | Current transformer unit and electromagnetic inductvie power supply apparatus for adjusting linearly output power using the same |
DE102014212502B4 (en) * | 2014-06-27 | 2018-01-25 | Dialog Semiconductor (Uk) Limited | Overvoltage compensation for a voltage regulator output |
US9581624B2 (en) | 2014-08-19 | 2017-02-28 | Southern States, Llc | Corona avoidance electric power line monitoring, communication and response system |
US9954354B2 (en) | 2015-01-06 | 2018-04-24 | Sentient Energy, Inc. | Methods and apparatus for mitigation of damage of power line assets from traveling electrical arcs |
WO2017024185A1 (en) * | 2015-08-04 | 2017-02-09 | Innosys, Inc. | Solid State Lighting Systems |
US9984818B2 (en) | 2015-12-04 | 2018-05-29 | Sentient Energy, Inc. | Current harvesting transformer with protection from high currents |
US9753469B2 (en) | 2016-01-11 | 2017-09-05 | Electric Power Research Institute, Inc. | Energy harvesting device |
US10634733B2 (en) | 2016-11-18 | 2020-04-28 | Sentient Energy, Inc. | Overhead power line sensor |
CN111033275B (en) * | 2017-08-11 | 2022-10-18 | 莱基动力公司 | System for generating a power output and corresponding use |
US10298208B1 (en) * | 2018-06-08 | 2019-05-21 | Siemens Aktiengesellschaft | Dynamic impedance system for an increased range of operation of an instrument transformer |
US11095125B2 (en) * | 2018-08-07 | 2021-08-17 | Aclara Technologies Llc | Device and method for harvesting energy from a power line magnetic field |
-
2019
- 2019-09-18 US US16/575,220 patent/US11476674B2/en active Active
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